Muffler for internal combustion engines



March 7, 1933. E. H. RADECKY MUFFLER FOR INTERNAL COMBUSTION ENGINES Filed Aug. 5, 1929 INVENTOR Edu/rd Jfdfddeck ry. Em

ATTORNEY entrance pipe 16 is shown as so proportioned Patented Mar. 7, 1933 UNITED STATES PATENT OFFICE RATION OF AMERICA.; A CORPORATION OF DELAWARE KU'FIFLEIR. FOR INTERNAL COMBUSTION ENG-INES Application med August 5, 1929. serial No. 383,464.

"My invention relates to muiiiers for internal combustion engines and has for its n that the simple device hereinafter described will operate with the required eiiiciency and may be more cheaply and easily produced than the kind of devices now in common use.

In the drawing, Fig. 1 is an eleva-tional view, partly in section, of my device.

Fig. 2 is a view taken on line 2-2 of Fig. 1. 1 Y

Y Fig. 3 is an end view.

Every form of the novel mufller unit may comprise two concentric tubes, preferably cylindricalv and of unequal length-the outer'tube being designated by the numeral and the inner tube by the numeral 11. Two identical but oppositely disposed end pieces, each comprising a single stamping, 'are preferably provided, the forward end piece being designated by the numeral 12 and the rear one by the numeral 13. The end pieces are preferably conical in general shape; and they may be formed with concentric shoulders serving both for the purpose of adding strength to the unit and for the purpose of providing oppositely deflected anges which make convenient points of attachment for the'tubes 10 and 11. The tube 10 may be welded, as at 14, to the outer shoulder of each end piece; and the tube 11, shown as shorter, may be similarly welded, as at 15, tothe Vinner shoulder of each end piece. An

as both to iitthe exhaust pi e of an engine and to be secured within tu e 11. For example, it may have one end welded, as lat 17, inv the central openingin the end piece 12; and an oppositely disposed Vtail piece 18, if provided, may be identical in form and may have one end welded, as at 19, in the central opening in the end piece 13,-to receive which EDWARD H. mimicxy, or DETROIT, MICHIGAN, 'Assrenoa To THE MURRAY conroi, v

the inner ends of inner flange of the end stamping may be inwardly oset.

Intermediate the ends of the inner tube 11 there may be positioned a cup-shaped baiie plate 21, which divides the tube 11 into two chambers, preferably unequal in length. The` bafiie 21 is shown as provided with a lateral marginal flange which snugly interfits with, and maybe suitably secured to, the inner surface of the inner tube. A second but apertured baffle plate 22 is shown as similarly positioned intermediate the ends ofthe tube 10 and at a point opposite the baffle 21. The illustrated baiile 22 has a cen.` tral opening Awhich permits a slidable insertion of the tube 11; and it has a lateral marginal flange, around this opening, which is secured to the 4outer surface of the tube l1 opposite the point at which the baflie 21 is secured to the inner surface thereof. The outer edge of' the baffle 22 is formed with a lateral flange Vwhich interfits with and may be secured to the inner surface of the tube 10; and .the inner tube 11, is shown as apertured in its respective end portions.

Those portions of the tubes 10 and 11 to the left of the substantially co-planar flanged baffles 21 and 22are hereinafter referred to as providing an expansion compartment; and they are preferably of greater capacity, by reason of greater length, than those portions providing a cushioning compartment to the right of thebafiies but the sizes of these compartments, each comprising a single inner Chamberland a single outer chamber, may be varied to suit conditions, and that part of the tube 11 .which thus subdivides the expansion or inlet compartment, to the left of the baffle 21,'is preferably provided witha plurality of groups of apertures. For example one group may be arranged adjacent` the halide 21 and another group `arranged adjacent a connection element serving as an-inlet pipe; and that part of the tube 11 which subdivides the cushioning or outlet compartment'to the right of the baille 21 may be provided with a plurality of apertures uniformly arranged'in a single group about the tube andl between the baille 21 and an oppositely disposed connecting element in the form of of sgidgxbe mh th 'pol-tien laerdgns thejnhl-mfof auch Hf., ggg

maf 7 gmane! e -mo t e 2 sagesvmthutlet-portinn thereof.

l EDWARD B.

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